The advanced Yealink headset adapter EHS35 provides a technical interface between your Yealink IP phones and a compatible Yealink wireless headset. The unit is easy to install, simply link EHS35 to the RJ9 (4P4C) headset port of the phone. Plug and play effectively gives you the ability to remotely control your Yealink phone calls, including answering, rejecting, holding, muting, hanging up, switching between multiple calls, and adjusting the volume. It has been especially designed to ensure maximum productivity in business applications such as receptions and call centers, and is ideal for the corporate, financial, health, government, educational, industrial, and SME/SoHo market sectors.